HEAT-EXCHANGER

PURPOSE: To facilitate fixing of an outlet inlet pipe and to decrease the thickness of a pipe fixing part by a method wherein the outlet inlet pipe connected to the outlet inlet part of a heat-exchanger is fixed by means of a leaf spring. CONSTITUTION: A notch part 44 having the inlet side opened to an inflow space 6 and the outlet side opened to an outflow space 5 is formed in a cylinder part 11 with a bottom of an outlet inlet part 10. Holding part 14 are formed by cutting wall parts 13 and 13 of the outlet inlet part 10 by a given length from a side end along a longitudinal direction. A contact surface between the outlet inlet pipe 4 and the outlet inlet part 10 is sealed by an O-ring 19 mounted in an O-ring containing groove 18 formed in the end face of a flange 15 of the outlet inlet pipe 4. In this case, the outlet inlet pipe 4 is brought into contact with a contact part 12 of the outlet inlet part 10. By pressing in the flange 15 in such a way to insert a jump-up 17a of a leaf spring 17 in the holding parts 14 on both sides, the outlet inlet pipe 4 is mounted to the outlet inlet part 10.